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	Equazione di Stefan-Maxwell	Approssimazione di Boussinesq	Leggi di Fick	Analisi psicrometrica
Campo	Termodinamica	Termodinamica	Termodinamica	Termodinamica
Famiglia	Process / pipeline	Process / pipeline	Process / pipeline	Process / pipeline
Anno di origine	1871	1903	1855	1911
Ideatore	Josef Stefan and James Clerk Maxwell	Joseph Boussinesq	Adolf Fick	R. E. Carrier
Tipo	Diffusion equation	Approximation technique	Diffusion law	Humid air thermodynamic analysis
Fonte seminale	Reid, R. C., Prausnitz, J. M., & Poling, B. E. (1987). The Properties of Gases and Liquids (4th ed.). McGraw-Hill. ISBN: 978-0071247009	Boussinesq, J. (1903). Théorie Analytique de la Chaleur. Gauthier-Villars.	Fick, A. (1855). On liquid diffusion. Philosophical Magazine, 10(63), 30-39.	ASHRAE. (2021). Handbook-Fundamentals. American Society of Heating, Refrigerating and Air-Conditioning Engineers.
Alias	Stefan-Maxwell equation, multicomponent diffusion	buoyancy approximation, Boussinesq model	diffusion equation, Fickian diffusion	psychrometrics, humid air analysis
Correlati	3	3	3	3
Sintesi	The Stefan-Maxwell diffusion equation describes how multiple chemical species diffuse through each other in a mixture, accounting for interactions between all species pairs. Unlike Fick's law, which assumes species diffuse independently, Stefan-Maxwell theory captures the coupling that occurs when species with different diffusivities move at different rates. This is essential for analyzing gas separation, combustion, catalytic processes, and reactive distillation.	The Boussinesq Approximation simplifies the governing equations for natural convection by treating density as constant except in the buoyancy term. This approximation is valid when temperature variations produce small density changes and allows researchers to solve coupled heat-fluid flow problems without solving the full, nonlinear compressibility equations. The Boussinesq Approximation is fundamental to analyzing buoyancy-driven flows in buildings, enclosures, and geophysical applications.	Fick's Laws describe how species diffuse through media due to concentration gradients. The First Law (steady-state) relates diffusion flux to concentration gradient, while the Second Law (transient) describes how concentration changes over time. These laws are fundamental to mass transfer analysis, applying to gases, liquids, and solids. Fick's Laws are analogous to Fourier's Law of heat conduction, replacing temperature with concentration.	Psychrometric analysis is the study of humid air (air-water vapor mixtures) and its properties. It is essential for designing and analyzing air conditioning, ventilation, and dehumidification systems. Psychrometric analysis relates dry-bulb temperature, wet-bulb temperature, dew point, relative humidity, and specific humidity through carefully constructed charts and correlations.